OPA members Otto Haslund, Aage Staffe, Per Mortensen and Børge Dahl in front of their Ford Deluxe. Copenhagen, Denmark, May 1945. BOPA was a group of the Danish resistance movement which was affiliated with the Communist Party of Denmark and developed after the occupation of Denmark, being mainly formed by veterans who had been part of the volunteer anti-Franco brigades of the Spanish Civil War. However, as arms were scarce, their weapons were often gasoline and matches, and only small-scale operations were carried out. The group, changed its name from the original KOPA (Kommunistiske Partisaner, Communist Partisans) to Borgerlige Partisaner (Civil Partisans) or BOPA in 1943. The new name was at first used jokingly by old members, since "borgerlig" in Danish also means "conservative", but it soon became the most widely used name. Operations grew in magnitude as individuals with inside knowledge of possible targets joined the group. Young apprentices from large factories proved especially useful in identifying targets that were supplying the German military.